to twitter
唽 centers on the sound of birds twittering or chirping, represented by the mouth radical 口 combined with a phonetic component.
唽 is a phono-semantic compound: 口 (mouth) suggests sound, and 析 likely provides the reading. The exact historical development is uncertain.
The mouth 口 beside 析 (which can suggest splitting or analyzing) creates the image of a bird's mouth splitting the air with rapid, repeated chirps.
For セキ, imagine a bird sitting on a fence post, twittering a sharp 'seki!' sound: seki -> セキ.
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